def solve():
    for _ in range(6):
        a,b = map(float,input().split())
        if a > 0 and b > 0:
            x = acos(a)*180/pi
            if x >= 52: x -= 60
            ans = x
    return ans
        
from math import acos,pi
n = int(input())
for i in range(n):
    input()
    print(solve())